vice president joe biden will soon get off a plane in the japanese capital and step into a dispute that's increased the friction between neighbors in this region. he'll be meeting leaders in tokyo, beijing and seoul to talk about china's newly established air defense identification zone. biden will sit down on tuesday with prime minister shinzo abe. abe has called the zone very dangerous. chinese defense ministry officials announced last month they'd set up the zone. it covers a large part of the east china sea. and includes islands the japanese control, but the chinese and taiwanese claim. biden will head to china after he leaves japan. the vice president will meet on wednesday with president xi jinping and other chinese leaders. analysts say biden is starting his tour in japan to highlight the decades-old u.s./japan alliance and to coordinate the response to china. he'll travel to south korea later this week. >>> u.s. leaders responded quickly to china's move with both words and actions. top officials criticize the chinese for trying to change the status quo in the asia-pacific. and mil